Spring tool



Patented Sept. 22, 1936 UNITED STATES SPRING TOOL Ernest John Blomquist, Siscoe. Quebec, Canada 7 3 Application October 25, 1934, Serial No. 749,965 r In Canada November 1'7, 1933 3 Claims.

The invention relates to a spring tool, as described in the present specification and illustrated in the accompanying drawing that forms part of the same.

The invention consists essentially in the compression spring operating mechanism in relation to the contact members, as pointed out in the claims for novelty following a description in detail of the constructional features.

The objects of the invention are to simplify the construction of the hammer type of drilling devices where, by the simple method of regular impacts, the drill is driven into the rock by blows in a more efficient manner than can be done by hand, and yet do this at the minimum consumption of power, which is the important feature in all rock drills and other devices requiring impacts to accomplish their functions; to replace many of the pneumatic and more complicated spring driven hammers, thus economizing in power and reducing the costs of maintenance, and generally to provide a satisfactory and inexpensive tool for drilling and other purposes.

1 In the drawing, Figure 1 is a longitudinal exterior view of the tool showing the operating cams in the lower position and in side elevation.

Figure 2 is a longitudinal exterior view showing the device at right angles to its position in Figure 1, and the operating cams in their lowermost position.

Figure 3 is a longitudinal sectional view showing the hammer spring holder and spring, and the operating cam and rollers in full. 7

Figure 4 is a longitudinal exterior view on the opposite side to that of the device as illustrated in Figure 2.

Like numerals of reference indicate corresponding parts in the various figures.

Referring to the drawing, the numeral [5 indicates the barrel of the device, which is threaded on the outside at each end and closed in by the caps l6 and H.

The barrel encloses the hammer [8 which is slightly reduced at the inner end I9 and the outer end 20, the outer end having the solid nipple 2| in said reduced end forming the actual contact piece.

The arms 22 and 23 project outwardly from the hammer body and extend through the vertical slots 24 and 25 intermediate of the length of the barrel l5, and these arms form bearings for the rollers 26 that cooperate with the arcuate shaped cams 21.

These cams 21 are fixedly mounted on the driven shaft 28, which is operatively connected to the driving shaft 29 from the motor 30 with a flexible shaft.

The cams 2! meet the rollers 26 and. facilitate the raising of the arms 22 and 23, and consequently the hammer, thereby saving considerable friction.

The shaft 28 is journalled in the bearings 32 closed in by the pillow block 33.

The spring 34 is of the compression type and this spring is stopped by the cap I6 and the spring holder 35 extends upwardly a part distance through the coils of the spring, having the body portion 36 slidably arranged in the barrel I5, and the reduced end 31 in engagement with the reduced inner end of the hammer.

The drill stock 38 is inserted through the ca ll while the cap I6 is left quite open for lubricating and cleaning purposes, the spring holder 35 having a central bore 39 through which the oil may flow to reach the hammer.

The handles 40 extend from the barrel adjacent tothe cap I6 and by means of these handles the tool may be held.

In the operation of this invention, the drill is directed to the rock by means of the handles as it has been previously inserted through the orifice in the cap I'I.

This brings it into direct contact with the nipple 2|. Then the power is applied either by hand or motor though almost in every instance, it will be operated by electric motor.

The shaft carrying the arcuate cams is now set in operation and these cams turn and raise the hammer in the side slots. This has the effect of compressing the spring against the cap I 6 until the spring is so concentrated as to have considerable force, and as soon as the tips of the cams and their rollers 26 pass, this concentration of the spring exerts enough force to drive the hammer at a high speed towards the drill stock and the recoil is taken care of by the driving spring, which effects a cushion through its engagement with the shoulder formed by the extension of the body from the reduced portion of the spring holder.

The actions of course, are very quickly done, one after the other, so that there is a continual rattling of the hammer on the head of the drill stock and this drives the drill into the rock in the same manner as is done by hand, though because of the speed of action, with much greater efiiciency.

What I claim is:-

1. In a spring tool, a cylinder having at one end a cap perforated for lubricating purposes and a tool orifice at the other end, double pistons Within said cylinders, one piston forming the hammer head and electrically operated and the other shouldered towards its inner end and carrying a spring thereon continuously pressing the lower reduced end below said shoulder against said hammer head and yet separated therefrom and means associated with said spring in vibrating said heads.

2. In a spring tool, a cylinder having at one end a cap perforated for lubrication purposes and a tool orifice at the other end, double pistons Within said cylinder, one piston forming the hammer head and having an arm projecting therefrom midway of its length and electrically operated, and the other shouldered towards its lower end and carrying a spring thereon continuously pressing the lower reduced end below said shoulder against said hammer and yet separated therefrom and means associated with said spring and arm in vibrating said head.

3. In a spring tool, a cylinder having at one end a cap perforated for lubricating purposes and a tool orifice at the other end, double pistons within said cylinder, one piston forming the hammer head and electrically operated, and the other havinga central bore forming a lubricating passage to the hammerhead and having a shoulder towards its lower end and carrying a spring therein continuously pressing the lower reduced end below said shoulder against said hammer head and yet separate therefrom, and

means associated with said spring in vibrating 15 said head.

ERNEST JOHN BLOMQUIST. 

